EECENT AMERICAN MICROSCOPES 



21 I 



tii in. In the last edition of this work it was shown that American 

 opticians made their first-class microscopes with swin^iii"' sub-stages, 

 and we then pointed out that these were not only without value. 



FIG. 169 A 1 1 1 . KID;. 



p2 



